.select-box {
    width: 150px;
    border: 2px dashed #aaa;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    border-radius: 3px;
    position: relative;
    background-color: #111;
    transition: all .3s;
    cursor: pointer;
}

.select-option-box-box{
    position: absolute;
    /*视频蒙版上面*/
    z-index: 20;
    display: flex;
    flex-direction: column;
    width: 150px;
    left: -2px;
    height: 0;
    transition: all .3s;
    display: none;
    opacity: 0;
}

.select-option-box {
    width: 100%;
    height: 40px;
    border: 2px dashed #d1d1d1;
    border-bottom-width: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #111;
    transition: all .3s;
}

.select-option-box:hover {
    background-color: #333;
}